请大家帮忙告诉我哪里可以找到关于Valentine✀s Day的资料，我想做PPT用，谢谢大家！

图片自己去搜集：
直接输入：Valentine's Day就能找到不少英文资料了。
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Saint Valentine's Day or Valentine's Day is a holiday on February 14. It is the traditional day on which lovers express their love for each other; sending Valentine's cards, donating to charity or gifting candy. It is very common to present flowers on Valentine's Day. The holiday is named after two men, both Christian martyrs among the numerous Early Christian martyrs named Valentine. The day became associated with romantic love in the circle of Geoffrey Chaucer in High Middle Ages, when the tradition of courtly love flourished.

The day is most closely associated with the mutual exchange of love notes in the form of "valentines." Modern Valentine symbols include the heart-shaped outline and the figure of the winged Cupid. Since the 19th century, handwritten notes have largely given way to mass-produced greeting cards.[1] The mid-nineteenth century Valentine's Day trade was a harbinger of further commercialized holidays in the United States to follow.[2] The U.S. Greeting Card Association estimates that approximately one billion valentines are sent each year worldwide, making the day the second largest card-sending holiday of the year behind Christmas. The association estimates that women purchase approximately 85 percent of all valentines.[3]

The reinvention of Saint Valentine's Day in the 1840s has been traced by Leigh Eric Schmidt.[10] In the United States, the first mass-produced valentines of embossed paper lace were produced and sold shortly after 1847 by Esther Howland (1828-1904) of Worcester, Massachusetts. Her father operated a large book and stationery store, and she took her inspiration from an English valentine she had received. Since 2001, the Greeting Card Association has been giving an annual "Esther Howland Award for a Greeting Card Visionary."

In the second half of the twentieth century, the practice of exchanging cards was extended to all manner of gifts in the United States, usually from a man to a woman. Such gifts typically include roses and chocolates. In the 1980s, the diamond industry began to promote Valentine's Day as an occasion for giving jewelry